QT tcpsocket与tcpserver通信

服务器端程序

#include "tcpserver.h"

#include "ui_tcpserver.h"

#include<QTcpServer>

#include<QTcpSocket>

#include<QString>

tcpserver::tcpserver(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::tcpserver)

{

//服务器端程序

 ui->setupUi(this);

    server=new QTcpServer(this);

    quint16 port=8888; //设置端口

    server->listen(QHostAddress::Any,port); //设置监听主机ip与端口

    connect(server,&QTcpServer::newConnection, //连接成功自动调用

            [=]()

    {

        socket= server->nextPendingConnection();  //取套接字

        QString ip=socket->peerAddress().toString();

         quint16 port=socket->peerPort();

        ui->textEditRead->setText(QString("[%1:%2]连接成功!").arg(ip).arg(port));

        connect(socket,&QTcpSocket::readyRead,

                [=]

        {

            char* data;

            data=socket->readAll().data();//以字节数组形式全部读取,后转char*

            ui->textEditRead->append(data); //追加

        }

                );

    }

    );

}

tcpserver::~tcpserver()

{

    delete ui;

}

void tcpserver::on_buttonSend_clicked()

{

   QString data=ui->textEditWrite->toPlainText();

    socket->write(data.toUtf8().data());//写数据注意格式转换

}

void tcpserver::on_buttonClose_clicked()

{

  socket->disconnectFromHost();//断开连接

  socket->close();//关闭

}

客户端程序:

#include "tcpsocket.h"

#include "ui_tcpsocket.h"

#include<QTcpSocket>

#include<QString>

#include <QHostAddress>

#include<QDebug>

//#define cout qDebug();

tcpsocket::tcpsocket(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::tcpsocket)

{

    ui->setupUi(this);

    socket =new QTcpSocket;

  ui->lineEditIp->setText(QString("127.0.0.1"));//设置ip地址

  ui->lineEditPort->setText(QString("8888"));//端口号

    connect(socket,&QTcpSocket::readyRead, //当接收信息后自动调用,准备读

           [=]()

       {

       char* data;

       data=socket->readAll().data();//一次性读取

       ui->textEditRead->append(data); //内容追加

       }

           );

    connect(socket,&QTcpSocket::connected,

            [=]

    {

        ui->textEditRead->setText(QString("连接成功!"));

    });

}

tcpsocket::~tcpsocket()

{

    delete ui;

}

void tcpsocket::on_buttonSend_clicked()

{

    QString data=ui->textEditWrite->toPlainText(); //获取写的内容

     socket->write(data.toUtf8().data());

}

void tcpsocket::on_buttonClose_clicked()

{

    socket->disconnectFromHost();

    socket->close();

}

void tcpsocket::on_buttonconnect_clicked()  //创建连接

{

    ip=ui->lineEditIp->text();

    port=ui->lineEditPort->text().toInt();

    socket->connectToHost(QHostAddress(ip),port); //

}

主程序:

#include "tcpserver.h"

#include "tcpsocket.h"

#include <QApplication>

#define QT_FATAL_WARNINGS

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    tcpserver w;

    w.show();

    w.setWindowTitle("服务器端");

    tcpsocket w2;

    w2.show();

    w.setWindowTitle("客服端");

    return a.exec();

}

qt tcp基本通信原理:

1.客户端设置:

  socket->connectToHost(QHostAddress(ip),port); //与其他主机建立联系

通过connected判断是否连接成功

接收信息通过信号readyread操作,再使用readall读取信息

发送直接使用write;

2.服务器端:

建立服务器对象,设置监听对象

用newconnection判断是否连接成功

接收信息通过信号readyread操作,再使用readall读取信息

发送直接使用write;